Calculate Center of Pressure for Rocket - Andy

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SUMMARY

The center of pressure (CP) for a rocket can be approximated using the Barrowman Equations, which provide a reliable method for determining its location along the nozzle axis. Users have reported discrepancies in CP location when using ANSYS FLUENT for 3D simulations, indicating that FLUENT may not yield consistent results. OpenRocket is recommended as an alternative software tool for calculating CP effectively. Understanding these methods is essential for accurate rocket design and stability analysis.

PREREQUISITES
  • Understanding of fluid dynamics principles
  • Familiarity with the Barrowman Equations
  • Experience with ANSYS FLUENT for simulation
  • Basic knowledge of rocket aerodynamics
NEXT STEPS
  • Study the Barrowman Equations in detail for calculating center of pressure
  • Learn how to effectively use OpenRocket for rocket design simulations
  • Explore advanced features of ANSYS FLUENT for improved accuracy in simulations
  • Research the impact of nozzle design on center of pressure location
USEFUL FOR

Aerospace engineers, rocket designers, and students studying rocket dynamics will benefit from this discussion, particularly those focused on stability and performance optimization in rocket design.

Andy_M
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Hi,

I'm wondering how to calculate the center of pressure for a rocket.
More precisely, i know that the C P is located on the axis of the nozzle but i don't know how to located it on this axis...
With FLUENT and a 3d simulation, Fluent can't located it (Fluent gives me 2 differents locations on the X-axis)...
Does it exist a simple relation for find it ?

Thanks for your help,

Andy
 
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A decent approximation can be found with the Barrowman Equations: http://my.execpc.com/~culp/rockets/Barrowman.html

You can also use a program such as OpenRocket: http://openrocket.sourceforge.net/

(Out of curiosity, what kind of rocket is this for?)
 
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